/*
 * Copyright (C) 2008 ZXing authors
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package me.shurufa.zxing.view;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.graphics.drawable.BitmapDrawable;
import android.util.AttributeSet;
import android.view.View;

import com.google.zxing.ResultPoint;

import java.util.Collection;
import java.util.HashSet;

import me.shurufa.R;
import me.shurufa.zxing.camera.CameraManager;

/**
 * This view is overlaid on top of the camera preview. It adds the viewfinder
 * rectangle and partial transparency outside it, as well as the laser scanner
 * animation and result points.
 * 
 */
public final class ViewfinderView extends View {
  private static final long ANIMATION_DELAY = 10L;
  private static final int OPAQUE = 0xFF;

  private int ScreenRate;

  private static final int CORNER_WIDTH = 7;
  private static final int MIDDLE_LINE_WIDTH = 6;

  private static final int MIDDLE_LINE_PADDING = 3;

  private static final int SPEEN_DISTANCE = 7;

  private static float density;
  private static final int TEXT_SIZE = 16;
  private static final int TEXT_PADDING_TOP = 30;

  private Paint paint;

  private int slideTop;

  private int slideBottom;

  private Bitmap resultBitmap;
  private final int maskColor;
  private final int resultColor;

  private final int resultPointColor;
  private Collection<ResultPoint> possibleResultPoints;
  private Collection<ResultPoint> lastPossibleResultPoints;

  boolean isFirst;

  public ViewfinderView(Context context, AttributeSet attrs) {
    super(context, attrs);

    density = context.getResources().getDisplayMetrics().density;
    ScreenRate = (int) (20 * density);

    paint = new Paint();
    Resources resources = getResources();
    maskColor = resources.getColor(R.color.viewfinder_mask);
    resultColor = resources.getColor(R.color.result_view);

    resultPointColor = resources.getColor(R.color.possible_result_points);
    possibleResultPoints = new HashSet<ResultPoint>(5);
  }

  @Override
  public void onDraw(Canvas canvas) {
    Rect frame = CameraManager.get().getFramingRect();
    if (frame == null) {
      return;
    }
    if (!isFirst) {
      isFirst = true;
      slideTop = frame.top;
      slideBottom = frame.bottom;
    }

    int width = canvas.getWidth();
    int height = canvas.getHeight();

    paint.setColor(resultBitmap != null ? resultColor : maskColor);

    canvas.drawRect(0, 0, width, frame.top, paint);
    canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, paint);
    canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1,
        paint);
    canvas.drawRect(0, frame.bottom + 1, width, height, paint);



    if (resultBitmap != null) {
      // Draw the opaque result bitmap over the scanning rectangle
      paint.setAlpha(OPAQUE);
      canvas.drawBitmap(resultBitmap, frame.left, frame.top, paint);
    } else {
      paint.setColor(Color.GRAY);
      // 画View的4个边.
      paint.setAntiAlias(true);
      canvas.drawLine(frame.left, frame.top, frame.left, frame.bottom, paint);
      canvas.drawLine(frame.left, frame.top, frame.right, frame.top, paint);
      canvas.drawLine(frame.right, frame.top, frame.right,frame.bottom, paint);
      canvas.drawLine(frame.left, frame.bottom, frame.right, frame.bottom, paint);
      paint.setColor(Color.RED);
      canvas.drawRect(frame.left, frame.top, frame.left + ScreenRate,
          frame.top + CORNER_WIDTH, paint);
      canvas.drawRect(frame.left, frame.top, frame.left + CORNER_WIDTH, frame.top
          + ScreenRate, paint);
      canvas.drawRect(frame.right - ScreenRate, frame.top, frame.right,
          frame.top + CORNER_WIDTH, paint);
      canvas.drawRect(frame.right - CORNER_WIDTH, frame.top, frame.right, frame.top
          + ScreenRate, paint);
      canvas.drawRect(frame.left, frame.bottom - CORNER_WIDTH, frame.left
          + ScreenRate, frame.bottom, paint);
      canvas.drawRect(frame.left, frame.bottom - ScreenRate,
          frame.left + CORNER_WIDTH, frame.bottom, paint);
      canvas.drawRect(frame.right - ScreenRate, frame.bottom - CORNER_WIDTH,
          frame.right, frame.bottom, paint);
      canvas.drawRect(frame.right - CORNER_WIDTH, frame.bottom - ScreenRate,
          frame.right, frame.bottom, paint);

      slideTop += SPEEN_DISTANCE;
      if (slideTop >= frame.bottom-SPEEN_DISTANCE*2) {
        slideTop = frame.top;
      }



      // 扫描线
      Rect lineRect = new Rect();
      lineRect.left = frame.left;
      lineRect.right = frame.right;
      lineRect.top = slideTop;
      lineRect.bottom = slideTop + 30;
      if (((BitmapDrawable) (getResources().getDrawable(R.drawable.sds_qr_line))) != null) {
        canvas.drawBitmap(
            ((BitmapDrawable) (getResources().getDrawable(R.drawable.sds_qr_line))).getBitmap(), null,
            lineRect, paint);
      }
      // canvas.drawRect(frame.left + MIDDLE_LINE_PADDING, slideTop - MIDDLE_LINE_WIDTH / 2,
      // frame.right - MIDDLE_LINE_PADDING, slideTop + MIDDLE_LINE_WIDTH / 2, paint);

      /*paint.setColor(Color.WHITE);
      paint.setTextSize(TEXT_SIZE * density);
      paint.setAlpha(0x40);
      paint.setTypeface(Typeface.DEFAULT_BOLD);
      // paint.setTypeface(Typeface.create("System", Typeface.BOLD));
      String text = getResources().getString(R.string.scan_text);
      float textWidth = paint.measureText(text);
      // canvas.drawText(" "+getResources().getString(R.string.scan_text), frame.left, (float)
      // (frame.bottom + (float)TEXT_PADDING_TOP *density), paint);
      canvas.drawText(text, (width - textWidth) / 2,
          (float) (frame.bottom + (float) TEXT_PADDING_TOP * density), paint);*/


      Collection<ResultPoint> currentPossible = possibleResultPoints;
      Collection<ResultPoint> currentLast = lastPossibleResultPoints;
      if (currentPossible.isEmpty()) {
        lastPossibleResultPoints = null;
      } else {
        possibleResultPoints = new HashSet<ResultPoint>(5);
        lastPossibleResultPoints = currentPossible;
        paint.setAlpha(OPAQUE);
        paint.setColor(resultPointColor);
        for (ResultPoint point : currentPossible) {
          canvas.drawCircle(frame.left + point.getX(), frame.top
              + point.getY(), 6.0f, paint);
        }
      }
      if (currentLast != null) {
        paint.setAlpha(OPAQUE / 2);
        paint.setColor(resultPointColor);
        for (ResultPoint point : currentLast) {
          canvas.drawCircle(frame.left + point.getX(), frame.top
              + point.getY(), 3.0f, paint);
        }
      }

      postInvalidateDelayed(ANIMATION_DELAY, frame.left, frame.top,
          frame.right, frame.bottom);

    }
  }

  public void drawViewfinder() {
    resultBitmap = null;
    invalidate();
  }

  /**
   * Draw a bitmap with the result points highlighted instead of the live
   * scanning display.
   * 
   * @param barcode
   *          An image of the decoded barcode.
   */
  public void drawResultBitmap(Bitmap barcode) {
    resultBitmap = barcode;
    invalidate();
  }

  public void addPossibleResultPoint(ResultPoint point) {
    possibleResultPoints.add(point);
  }

}
